Rotary kiln and cooler



July 3, 1928.

P. T. I INDHARD ROTARY KI'LN AND COOLER Filed Feb. l2, 192.6 4 Sheets-Sheet l INVENTH July 3, 1928. K 1,675,416

l P. T. LINDHARD ROTARY KILN AND COOLER Filed Eeb.12, 192s 4 snets-sheet 2 Fil? July 3, 192s.

P. TLINDHARD ROTARY KILN AND COOLER Filed Feb. 12, 1926' 4 Sheets-Sheet 3 /NVENTR July 3, 1928. 1,675,416

P. T.` LI`NDHARD ROTARY KILN AND COOLER Filed Feb. 12, 1926 4 Sheets-Sheet 4 Patented July 3, v1928.

:UNITED STATES PATENTv OFFICE.

v IPOVL T. LINDHARD, OF BROOKLYN, NEW YORK, ASSiIGNOR '.110 F. L. SMIDTH & CO., OF

NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

ROTARY KILN AND COOLER.

Application mea. February 12, 192s. serial No. 87,746.

`I0 tion, and to prolongation of use Without repair. The invention is articularly concerned with the following eatures: the closing of the end of the kiln; the support ofv the cooling drums arranged about the pe- 15 riphery of the kiln and revolving therewith,

and the protection of parts particularly liable to Wear by the clinker in its movementy from the kiln through the cooling drums.

The invention Will be more fully explalned 20 hereinafter with reference to the accompany ing drawings in which it is illustrated and in which:

Figure I is a view in longitudinal sectional elevation of a portion of the kiln with its appurtenances;

Figure II is a View of the same. in end elevation as to the' right-hand portion and as tothe left-hand portion in section on the several planes indicated by the broken lines D-D, E-E and F-F of Figure I.

Figures II and IID are detail views of alternative forms of connection between successive cooling drums of the outer series, the location and direction of the views bein indicated by-the broken lines A-A and -B respectively of Figure II. v y Figures III and IV are detail views illustrating particularly the ,connections of the cooling drums of the inner series to the kiln at the forward end of one of such drums, Figure III being a longitudinal section on the plane indicated by the broken line H-H of Figure IV, while Figure IV is a transverse section on the plane indicated by the broken line J-J of Figure III.

Figures V, VI and VII are detail views, respectively'l in sectional side elevation, in transverse elevation on the plane indicated by the broken line of Figure V, and in, t'op` view illustrating particularl the means for supporting the doors by w ich the end of the kiln is closed. y

The kiln may be formed substantial] as usual, except as hereinafter indicated, aving a shell 1 with a fire-brick lining 5 and be supported by tires 2 and rollers 3 on foundations 4, one of each of these parts being shown in Figure I. Around the drum, near its lower or discharge end, are 'supported as hereinafter described, two circum ferential series of cooling drums 6 and 7, referred to hereinafter for convenience as drums of the inner series and drums of the outer series. The clinker is discharged from the kiln through lined openings 16 into the drums 6 of the inner series and fromeach drum of the inner series into the corresponding drum 7 of the outer series, from which the cooled clinker may be discharged through a chute 8 upon a conveyor 9. A hood 10 surrounds the kiln and the cooling drums above at the level of the burners platform 11 and provides for a proper circulation of cooling air about the cooling drums. The burners platform is shown as supported upon standards 12 which may conveniently be extended above the platform for the support of the members upon which the fuel pipe and the doors at the end of the kiln are mounted.

The portion of the kiln within the circum ferential series of cooling drums is preferably reduced somewhat in diameter exten nally, as indicated at 15, and near its end are formed the openings 16 through which the clinker is discharged. Each opening is provided with a sleeve lining or bushing 30 which protects the re-brick lining of the kiln and the frames 13 and 14 external to the kiln and by means of'fwhich the corresponding end of each of the inner cooling drums's secured to the kiln, the frames 13 and 14 forming a tubular neck into which the bushing 30 is extended. Each lining` or bushing 30 is preferably formed with an external shoulder 31 to bear against the shell 15 and assure the proper positioning of the parts. The linings are further secured in position. by cap screws 32 through the frames 13 which are suitably secured to thev shell 15 as, for example, by welding. Both the frames 13 and the frames l14 `are suitably flanged to receive bolts by which the `frames 14 are secured to the frames 13, the ooolin drums 6 being supported at their `forward ends within the frames 14, as clearly shown in Figures III andIV. y

At their rearward ends the inner drums 6 receive flanged frames 17, to which are 'rigidly secured smilarfanged frames -18 secured to the rearward ends of the outer cooling drums 7, which are supported at each end from the shell of the kiln by plates 19 and 20-respectively, which are suiiiciently flexible to permit the drums 7 to expand and contract longitudinally with the changes of temperature. The plates 19 and 20 are secured to'langed brackets 21 and 22 respectively, secured to the shell of the kiln,

yand are connected to the drums 7 by flanged brackets`23 and 24 respectively, secured to the ends of the drums 7.

It will be seen that each inner drum 6 ispartly supported at its 'ends by tubular l5 extensions or trunnions 25, secured by bolts 28 to the ends 27 of the drums in registration with central openings therethrough and `provided with removable caps 29 to give access to the interior of the drums 6 either for observation or for clearance in` case of placement.

clogging of the material' in the drums. It will be noted that the inner drums 6 will be supported in place by the plates 19 and 20 if the drums 7 are removed for repair or re- It will be understood that when the kiln .expands longitudinally toward the discharge end, as indicated by the arrow shown in Figure I, the drums 6 of the inner series,

30 being held -rigidly to the kiln at their forward ends, will expand longitudinally in the opposite direction, as indicated' by the arrow shown therein and that the drums 7, being rigidly secured to the drums 6 at theirrearoward ends, will move rearwardly with the longitudinal expansion of the drum 6 and at the same time will themselves expand longitudinally in the opposite direction, as indlcated by the arrow shown therein. The movement of the drums 6 and 7 will be permitted by the flexible plates 19 and 20 withf .out danger of rupture of rigid supporting members.

The trunnions 25 are of such size as to be members.

The drums 6 are preferably provided with suitable internal iights 6ti so as to facilitate the movement of the clinker therethrough and the drums 7 may be provided with suitable devices, such as chains 7n and longitudinal ribs 7b to retard the movement of the clinker therethrough and .to promote the interchange of heat between the clinker and the cooling air which moves in a countercurrent through the coolingdrums. v

To prevent the clinkenwhieh has passed from the kiln into any of the inner cooling drums from falling back into the kiln as the drum moves upward in its revolution about the axis of the kiln, there is secured to the inner face of the plate 27 of each drum 6, as by bolts 34, an open frame 33 which carries on that side which is the lower in the upward movement of the drum, a guide or spout 35 which is disposed obliquely with respect to the axis of the drum. As the` .iiights therein, and it is prevented from falling back into the kiln as the drum passes above the plane of the axis of t-he kiln. A similar guide may be placed inthe feeding end of each outer drum 7, as indicated at 33a in Figure I. In order that the drums 7 of the oute series may have proper support circumferentially in the irrevolution about thev axis of the kiln, and the stresses upon the flexible plates 19 and 20 may be reduced, and the danger of rupture due to the employment of rigid connections be averted, provision is made for a somewhat flexible or yielding connection between these drums, preferably at each end. Such connections may consist of a plate or strap memberbolted at its ends to the supporting frames of two adjacent drums and bowed in a horizontal direction, as shown at 37 in Figures II and IIa, or in a radial direction, as shown at 36 in Figures II and II". As the kiln shell 15, to which the inner ends of the flexible plates 19 and 20 are secured, is subjected to higher temperatures than those to which the attaching brackets 23 and 24 are subjected, the platos 19 and* 20 would be subjected to severe stresses unless the connections between the drums at the points 23 and 24 were made sufficiently flexible to permit of relative movement between the drums.

To provide for effective closing of the end of the kiln under all conditions, regardless of varying expansion and contraction of the kiln longitudinall and at the same time to facilitate the manipulation ofthe closing devices in the operation of the kiln, provisions aremade which will now be described, with particular reference to Figures I, II, V, Vl and VII.

As shown in Figure I, the kiln shell 15 is formed at its end with an 'inwardly extending flange 38, to which is secured a channeled annulus 39 which has an outwardly extending fiange 40, which may be machined on its inner face for close contact with the outer face of an inwardly extending flange 41 of the two-part door 42. This interlocking of the door with the end of the kiln insures a tight joint under all conditions, the door being supported movably in the direction of the axis of the kiln so that it moves with the end of the kiln inl the longitudinal expansions and contractionsof the kiln. l

' ATo permit the proper assemblin of the door and the kiln and to facilitate t ie opening of the door when necessary, the door 42 is made in two parts which meet in a vertical line in the plane of the axis of the kiln, the two parts being formed with flanges 43 by which they may be secured together. Each part of the door is supported by wheels 44 on a beam 45, extending' from side to side, which is itself-supported at its ends by trucks 46 rolling on tracks 47 carried by longitudinally disposed beams 48. As shown flange in detail in Figures V, VI and VII, each truck is composed of two plates 49 which support a ball bearing 50 to receive the gudgeon 51 secured to the corresponding end of the beam 45, the plates also supporting wheels 52 which run on the track 47. .The two-part door is therefore free to conform to all movements of the end of the kiln and thereby maintain a tight joint, while at the same time it may be manipulated easily whenever access to the interior of the kiln is desired. The trucks 47 preferably have the same inclination as the kiln itself so that the flange 41 of the door members is held by gravityin contact with the flange 40 of the kiln.

The door is provided as usual with peepholes 53, observation doors 54, and `an opening 55 for the fuel'pipe 55". The beam 45, as will be observedis preferably formed of two channels with a spacer l56 between them at the center to form a stop for the door members. A stop 57 secured to the platform 11 cooperates with brackets 58 on the door members to prevent the door from working out of place in the rotation of the kiln. Upright members 59 support, between its ends,-the top member 60 of the frame and furnish convenient support for rollers 61, on which may be rested the bars or pokers which are somtimes required in the removal of clinker rings sometimes formed within the kiln. It may sometimes happen that the `draftiwithin the kiln draws the door members forward sufficiently to take the l 1 of the door members out of contact wit the flange 40 of the kiln and thereby permit leakage of air. To prevent this there may be attached to each door member a chain 62 which passes over a. pulley 63sttached to upright member 59 ,and has connected at its other end a weight 64 which is sutlicient to holdthe door with itsflange 41 in contact with the flange 40 of the kiln under all ordinary conditions of pressure.

It will be understood that various changes in details of construction can be made to suit different conditions-of use and the convenience of the manufacturer and that, except as pointed out in the claims, the invention is not restricted either to the details of constructions shown and described herein or to the embodiment in one structure'of all of the features described.

I claim as my invention:

1. The combination of a rotary kiln for use in the manufacture of cement, having in its end portion a circumferential series of openings through which the clinker is dis-' charged, a circumferentialseries of cooling drums supported by the kiln about itself and communica-ting respectively with the kiln through said openings and into which the clinker is directly discharged by gravity, a tubular neck secure-d lto each drum, a removable bushing in each of said openings and extended inwardly beyond' the shell of the kiln and externally into said tubular neck to protect the lining of the kiln and the associated parts from wear and means to secure the bushing removably in such posi tion.

2. The combination of a rotary kiln for use in the manufacture of cement, having in its end portion a circumferential series of openings through which the clinker is discharged, a circumferential series of cooling drums supported by the kiln about itself and communicating rspectivel with the kiln through said openings an into which the clinker is directly discharged by gravity, and a removable bushing in'each of Said openin s and extended inwardly beyond the shell o the kiln to protect the lining of the kiln and the associated parts from wear, the bushing being formed with an external shoulder for contact with the shell of the kiln to position the bushing.

3. The combination of a rotary kiln for use in the manufacture of cement, having in its end portion a circumferential series of openin s through which the clinker is discharged, a circumferential series of cooling drums supported by the kiln about itself and communicating respectively with the kiln through said openin and into which the clinker is directly disc arged b gravity, a removable bushing in each of sai openings and extended inwa-rdl beyond the shell of the kiln to protect t e lining of the kiln at said openings and the associated parts 'from wear, a frame secured externally to the shell of the kiln about each opening, and means carried by the frame and engaging each bushing to hold the, latter removably in position. v

v4. The combination of a rotary kiln for use in the manufacture of cement, having in ff its end portion a circumferential series of openings through which the clinker is discharged, a circumferential series of cooling drumssupported by the kiln about itself and communicating respectively with the kiln .through said openings, and an obliquely disposed guide withinithe drum at one side thereof to direct each clinker vonward into the drum and to prevent it from. falling back l0 into the kiln in' the continued revolution of the drum with the kiln.

5. The combination of a .rotary kiln for use in the` manufacture of cement, havingin its lend portion a vcircumferential series of openings through which the clinker is discharged,a circumferential series of coolingA f drums supported by the kiln about itself and communicating respectively with the kiln'through said openings, an end plate for each drum, an open frame secured to the inner face of each endplate, and an obliquely disposedguide supported by the end plate within the drum at one side thereof to direct the clinker onward into the drum and 25 kto prevent it from falling back into the kiln in the continued revolution of the-drum with the kiln.

6. The combination of a rotary kiln, for use in the manufacture of cement, having in its end portion a circumferential series of openings through which the clinker is discharge a circumferential series of cooling drums communicating respectively with the kiln through said openings, a plate secured Il to the kiln at each end. of each drum and having an opening therethrough, and a trimnion secured to each drum at each end thereof and entering the opening in the corresponding plate to `-support the drum. 40 7. The combination of a rotar kiln for use vin the manufacture of cement, havin in its end portion a circumferential series o openings through which the clinker is discharged, a circumferential series of-cooling drums communicating respectively with the kiln through said openings, a plate secured tothe kiln at each end of each drum and having an opening therethrough, and a trunnion secured to each drum at each end there- 60 of and entering the opening in the corresponding plate to vsupport the drum, the

trunnion bein hollow and provided with a removable en cap to give access to the interior of the drum. y

8. The combination of a rotary kiln for use in'the manufacture of cement, having in its end portion a circumferential series of openings through Which the clinker. is discharged, a circumferential series of cooling-4 drums communicating respectively withthe kiln through said o enings, a plate secured to the kiln at each entf) of each drum and having an opening therethrough, and a trunnion secured to each. drum at each end thereof and g5 entering the opening in the corresponding to the kiln and secured to the drums of the plate to support the' drum, the trunnion being hollow and provided with a removable end cap to give access to the interior of the drum, and the end late of the drum and flanges of the trunnion being formed with slotted openings for the lreception of bolts by which the trunnion is secured to the end plate of the drum.

9. The combination of arotary kiln for use in the manufacture of cement, of-a circum ferential series of cooling drums supported about the kiln, connections throughwhich the clinker is' discharged from the kiln to said drums, a second circumferential series of cooling drums 'external to the -first series of drums and arranged to receive at one end the partially cooled clinker from the drums ofthe first series and to discharge the cooled clinker at the other end, and iexible plates secured -to the kiln and secured to the drums of the external series, one atv each end of each drum. i

10. The combination of a rotary kiln for use in the manufacture of cement, of a cir* cumferential series of cooling drums supported about the kiln, connections throu h which the clinker is discharged from t e kiln to said drums, a, lsecond circumferential series of cooling drums external to the first series of drumsI and arranged to receive at one end the partially cooled clinker from the drums of the first series and to discharge the cooled clinker at the other end, and flexible plates secured external series, one at each end of each drum, each drum of the inner series bein secured at its feeding end to the kiln andg the two 4corresponding drums of the inner series and the outer series being secured together at the other end.

11. The combination of a rotary kiln for use in the manufacture of cement, having in its end portion a circumferential series of openin s through which the clinker is discharged, a circumferential series of cooling drums supported by the kiln about itself and communicating respectively with the kiln, and flexible connections between the successive drums.

12; The combination of a rotary kiln for use in the manufacture of cement, having in its end portion a circumferential series of openin s through which the clinker is disf charge ,l a circumferential series of cooling drums communicating respectively with the kiln, flexible plates secured to the kiln and i extended flange to cooperate with the ange 130 Y* of the kiln, tracks inclined away from the kiln, and trucks mounted on said tracks and supporting the removable door.

14. The combination of a rotary kiln for use in the manufacture of cement, having an open end, a two-part removable door to close the kiln, longitudinally disposed tracks at -the burning end of the kiln and extending rearwardly thereof, a transverse beam Supported on said tracks, and means whereby each door member is independently supported on said beam for movement across the rear end of the kiln in the plane ofthe beam.

15. The combination of a rotary kiln for use in the manufacture of cement, an annulus at the end of the kiln having a rearwardly and outwardly extended fiange to form a circumferential channel at the discharge end of the kiln, a sectional door to close theend of the kiln, an inwardly extending flange on the door projecting into the' channel and permitting allimited movement of the door with respect tothe kiln, and means to urge the door rearwardly away from the kiln when the former .fis in the closedposition whereby the flange of the door is maintained in contact with tlie ange of the annulus.

16. The combination of a rotary kiln, for use in the manufacture of cement, an annulus at the'end or' the kiln having an outwardly extended liange, a sectional door to close the end of the kiln and having an inwardly extending lange to cooperate with the flange of the annulus. a chain connected to the door,

a pulley mounted independently of the kiln structure and over which the chain is guided and a weight connected to the chain tending to move the door away from the kiln to maintain the flange of the door in contact with the flange or' the annulus.

This specification signed this 11th day of Jannary A.. D. 1926.

POVL T. LINDHARD. 

